Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce750ad3e413095e43c4b2c2a49c87a1dce3fe59f33d4de0ca29bded516c9a71' 
  AND token = 'HKTNYFiXDVxlDGkc61/6+bJ5xcaR57tJbtu1unibsIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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