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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3d89a0979ea6767a70d56cad5019ee372077109ddba405c13e77f495066fa79d' 
  AND token = 'GW96O32R8Ato57NZ8Pf82DDV5TP0CTWTeNOYHHBc38k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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