Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54b863a1e1667629f37b348782f14074f6165c56b24d7e368d721e62cb036816' 
  AND token = 'CKtrVy193QFkIGnulggd6mTA17MjO1sQKlqIOFHQbk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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