Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afa86021b0f2a37b876fa113b66d1690f2b7fce2714d02e03c8ddaead613323e' 
  AND token = 'Luv+JqXsDU7nTo1Ju9dQ7QmTNBEh6dKDF50s3sayVHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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