Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4cbd3a6f9e94af01531a13fe39523225b7f50a79b1f25115017b5a3a6b264ac' 
  AND token = 'uGr3Q6FA/LLy8uyGsfhsl8Svj7mtw7tqJ/mCvpf3Eu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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