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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '04d7de2210f0f26d4e549fb74e7b1e3b9f78e7c5b8834f557b045969c5535fcb' 
  AND token = 'JFOHAXf5ykQnNCMxOSAlMMJpzn8lu8CPmq3aOlcnQFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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