Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b47d658f3b9e831e905a6b22f89a266850859cd512d9e056db9cf44912d91775' 
  AND token = 'MyVyGGVUDc0QN7ViOPLC9s6jye1mG2P/aq2kTjA3tpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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