Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b92f81e684c0db15d868f1adc5e05d6b1d069ce87513bd919df6e06ec4fde1' 
  AND token = 'iAwW2zFXmB27aog67kEcDuyUWcZqceTalhp3a/SNxMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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