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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6ba48313e21dc2ee41e58034059be2d2335ed0503c79806dced87e5fcb8a92ca' 
  AND token = 'tnxhaGS0+AcNhEKJKbkBXjEiXsqODA7YSFh6yNbVX9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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