Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6b1bb051bef17bff5fe10582de03ab2c3eed47e2162cbadbadf2d19b1654230' 
  AND token = 'A7PzymotiHe5p2AZqg0SC7AKILERKWeho26JVe2KNeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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