Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e378dfbe672f47b3571c634bfaefdb8611a991afb4b830c0181dbec423ce14cc' 
  AND token = 'U2lwc/ma1aVjcUx9hzcfr/94Hm4BhFJr+IqTo3z0PN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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