Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02c64ba4b71ee32b0d5d0f1cccb026ee8fa973ab35523ec1d8087d24b79d7fd9' 
  AND token = 'uixkAoVgVn9eKBpROkJplGvT7vhl/YhqodbyTD7er7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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