Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3d41aa174d1d7695152edc0f2444044b8015d49d50a60bcafe743fd26885e4d' 
  AND token = 'J7ckGgAPT3G4M7HbswmWwPUOHyPj0Bt+7b0xKvqrMc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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