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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b093c07279a26be95313b9186791b291c7c80f767fbd069f7b786681992ff68c' 
  AND token = 'HxKrPzFE27xS6qIe8zPe5LPC4iaLBDlf10AMXzqs9rI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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