Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8923505119a49da5a578574323065a67a798af67f0e2de93264e921ccf597226' 
  AND token = '/5Si/Wls15TQBylFBr7ZvAB9xi0iOAVI6LkQ+d3/Ex4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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