Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4ef564176d6fc14b99d21f490a152fe0cc2f3497dac3447d95004a78320a1c7' 
  AND token = 'A6epOQb4SVeOY/fuIPvofI/traY/vqkNJJ9P+roWEIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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