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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ef516a2d9e56103d7e32ea7e4230a55727a18fccf752310ebfd2bed2a128bd4e' 
  AND token = 'Jgy0/TGsoFczHoOmQgXuE0UMzJOjY5CojYxrS67C+8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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