Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37800176026119554904f0a3141dc1b9ce0e990411aa5ea5e67c98194d59cc4a' 
  AND token = 'EJjdNeYJeisdpDtfGQ/h1bu93aY/uY3MK0MnxCNQZR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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