Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49809f9b65a387f1b3a2cd8d4d1d1cdccda1da5a83f2d4a450444d929a1498c8' 
  AND token = 'K7adI4zHGXdUPCquOO583RdKFXE4VJUt+/ckaFqCQ1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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