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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1e1fb75fbddd55bf686550668f28022f66f5417767c021be29db9ffe953b49ae' 
  AND token = '2OttkT9jlTi9orlSoFaBiXjbSCyY+vLn7k1guG0j9Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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