Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd57b0e0a819e281e565049d548b0c7d9c1df721b089a23e6642add7ba1a1e5' 
  AND token = '1b1j7wF0z/Fz/F5ejsSQ/S6ULi93C9oa5XpFT/Lzito=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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