Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d1792ded26f1d1af86e64736a9de94d8f25fab35da83b9d5996a3facc0e87a' 
  AND token = 'pX2Dl2tE6LIS5lzUqHPTHzedbRSs4tss7Yq1rV3kSz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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