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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c6bb8e5ebab2a318f79c4249b2d595384b0d34025967c126364ac2cabad7d3ef' 
  AND token = 'POYT22Y/AsT90gF5S9PBe1NpKsIUuLOQfNWpq36x+/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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