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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5b02a7fe934741256cf097273a50b6b3d570ed10e97a6d7087d4cc9bc5c0d3ef' 
  AND token = 's6gFqePle70h2t3wZzboPFanNiYzBtU6h7WmQKxHXVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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