Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3c120110f02cf1635ebc551d078cf8f3989f371d48f9c0525cec37f65a9c8ec' 
  AND token = 'EmOn3Mvt/lFsO9b9zSQbVL8+WD6DQ8PKtvAdC7sFGkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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