Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3fd54ed9efb0b8253d4001fc85dcd4b6560a51a02fa25dc12abf36fc5847531' 
  AND token = '8jyuhgkrO/JAlhKqIm6DbeaywhTx7/IhVvfUwEp6pMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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