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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'aed56ead2b1ef38a22df47638c25d765727965c35a5875eb9c964341c131592f' 
  AND token = 'yiof1qWKe+GCGbxahdEkpFvwHzxHYb43mH4OKbUuRP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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