Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51a60e648dfa41c9feaa376c718ddc72cb348c6b09e1a2334c6186b4046eafbb' 
  AND token = 'SSMjdo11urMhPYWUkN+5BYXbZ1FEKmvdsw4qqC1rs4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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