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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ab6c5d9ee680658c4175e39f088aa2b405e72381b05a69b5286639f375c64319' 
  AND token = 'bldbEoOAoHynWSmH6uguU8ykj3fMEsIaYMsLrjK9tkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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