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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'de074e34a0de9d9ec1bfdf987e5f0c9ccdf536d38870c004e6ac307e23446538' 
  AND token = 'B3NtayOt/JuKXs9VOxotydF9SN5AbP2hZf+iQyH1KR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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