Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '917cd4a8a5ed9c7dddd48a91f418507d3e94dbee93b4dbcee178f326db1a361a' 
  AND token = 'c3zV4GMX/r7AMyHPVD/oqDHj9h9PS+YJ0fS0SFPEmV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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