Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3e3055f0197f64d5a8dff774f7ab299af8636b47e9e335d65586aadff314f29' 
  AND token = 'a17U45jCvmGVK7C4ac4v7+eNu+gLeAiiVkz1BaXE3us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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