Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '509b0c2a45de5f7e4f9ff4bb4d45da9737d00534d51a9d8719ab7589a108b7b5' 
  AND token = 'LsvnBj0ZiEMQoKX7Tw+p0VrSPQW4UDW0xrByIgjZuTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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