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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5ea23c9eb1e8a4db3cb8a165bf6e4931e3799056b635f6753a11a551d6047ebf' 
  AND token = 'UidkojkDCdsyTRUWT+fsdJSdh40d8jhWYGercu8Cof4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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