Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12129448c67c9a306671a774d74f298e83e44aa183a253de527d13538c57ab51' 
  AND token = '0lCodtKiFB90cKuUCCgW9ZUxqI3u4I81RdrH5ELX43c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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