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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8798642d85e0640de4b1a4304bea9cad7438b8c649ac90a1cc0b1ca5b0030097' 
  AND token = '1tAc7dZZ5TVSlHvSJbQyWfjJ0vNjhTZ2sdUL8OVCmmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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