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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8d4cb1d3f7239cbd5fc35993d8eba71b946a15849e9c14f35f2485282e905d7b' 
  AND token = 'vkN9sm8M/gjpwp+97YIQhTEGRPTtZ6m94dZtZCXAP34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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