Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcd448ed11990bc10ff4db5967f6e1d03857cfbf3da56d0a3ad7d4fb1be5ee2c' 
  AND token = 'zuveapXH8jvMu3+k5lvlLUGy2Y/1qzpaO0JaSxtGm60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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