Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '187d721b40aa5c4dff1ac284f4ec0715b1e4afa1fb8b1cb86e4c7f15418591d1' 
  AND token = 'kPAfQYeo6AALAl1WE5MnHGkiaeCblJ7RKGBqWLN1qBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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