Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cd5c6b6071739fa012bc2a4aa838c6a0fd03a6a0f1d134930ab7722f8651bae' 
  AND token = 'X7TKtQt6RQjnIsO/hAmg+EAGnPtD49ED7m34UjwlYmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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