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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd51ead92ea7a9871d99bf72623b72bf56d2406063f05ae1bb2fb338cfb0e33aa' 
  AND token = '0YfCcG52oAMhDN1WNDMUBaOW4+97e2X6iUaplGjkRj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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