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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '23a39c04b71761260f995a0dce55b4bd363d534abb0dc31ec7f87c7c6cb29c70' 
  AND token = '7qFyv24OwuWcR36YDA64hqFtll4oaN2fZeR8Gx8Cv+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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