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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9db34921016f594ecc796b9039b12357c605e7d48b1b4c34c71ed32b0e738883' 
  AND token = '7/kWgecK5qgzU9gRFpohXB5kLgI+Pot76/aLkW9TaTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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