Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68c84187945b5afdc7958f9f321ce2cbcec199e34610fc7d04bd9c0cd3aede6d' 
  AND token = 'eQ4NI40sfoFyjZu23Jxxz+OF0RMbBNiebCdsyRWrsc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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