Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6f478a4f7108a2fc04e842b3afa292c867a4a28489645b601fbd6521c2a865d' 
  AND token = 'oP67pM7JV6Q0f7hUSoGfXTwPkoN1aC7phGPT7xQ8bnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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