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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a3f7e07d4aadab72b9bcabbe9df45357f689558241edf31a115e51ba47480b4e' 
  AND token = 'oLoSndXsmo79qPenqo2zRJXxcLH7Yvc/D+XddPr6WK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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