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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1583bdc20c97515825128fc2fce3583550aafffb2273be6822b19e82647e5a4a' 
  AND token = '2kH22F0m/biPlKhKGV3qoNYcX4wfQ1M1peqJP34iaK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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