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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '479ca057730fc73a3323385c2c3cd65389b6e6fc2c8ad37ec10d141ba1eebc46' 
  AND token = 'MkKVwbrZcqaedPRqKl4pVzJkIAlCLTjJzvfQE0cv2hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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