Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9df421a51d88948830034a3a59a91214a55f4374e7f442ef7e95a1325178d464' 
  AND token = 'P9L0gcK9KOSV46pPAMopKW3PIwN4ORLMpR2fSgZvd5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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