Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a9a6dc7b1b16c1a918e14188d4ac9718155fc90028eb89077a1041faca510c2' 
  AND token = 'SFIX7CuLI1GHmMcW2mSwIfjHnMt3P7q+0Z7KatUIkbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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