Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fffbb5b6a2121684b5ff7452df4a919f8a2e02c0b907542f4f817aeeaecaa039' 
  AND token = 'AaPsInqdE0JIymzxYGxis0mNGjlsJ4w2DQ6T8eDQ2lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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