Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df687974fe6865c9f8965f9e3a05c17b4314bab9c1c6341ac6d9b7185ced2e9b' 
  AND token = 'fRNTfnUsDPDXFwx9fr92Me6yO+Y5lr6UJvp2d2ip1vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}