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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e1833fb0c1f0ef4bc3b36e4daa941ae0a5f05d80361e5bbae7ccc5f449fdbde8' 
  AND token = 'M7tzMrm1+42OlN4uQoEPGwjrvVT9CS9Aj1C5AlYF1cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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