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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '90f77af74aa6a32042813f585bdcb997829bc9c3ccb532cf3fc413386efe6cdd' 
  AND token = 'msuMZfK4StGIIHdUIyJSOXMEDzZqN3cL7YU4xjWUTlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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