Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a67d15d0d3932089d3c196cb68c61e9ba64ed6121d6dc1a76a13fd5eb4fb4ed0' 
  AND token = 'CZt/s3e3MaTw/+iIutTAzjSMd8ldcUwfApgbneltN8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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