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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a193e428353ba55efde9e84be7fe0f67668ea0ff739d7589c27c0accf7bddd8c' 
  AND token = 'Nyj65Ozks6FoY1N29jK1UmkUNpBVpK+LnVea0iJFez4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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