Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a1c3424829088a343a6421eb6ff424fa0205fb0818b627d0460d16a6c11a1e19' 
  AND token = '75CH3EOhgnnsZWwR3d5hs3w42/D1hwLpXMMi3I7LKsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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