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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '34971952fc1385b3d8fd3f89c4aeaabd70e07cc1df6a439471f1186582ccee8f' 
  AND token = 'ph9RmAz9limVzWZEYVKiCt+XeWLAbe0NjmIWygniuQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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