Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b864cf57dc9a65aa89eb9f9fdd0d5ffe62021cc4a27c7e8410fd87b0aa50b63' 
  AND token = 'Qb6wZhIrW05YoMO+25WAdi5U2pSU4I1+Ng6P2dbl+k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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