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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd9cf241381dea2a32226d3ab5fe3f0b478c6cbed86bb6bc6e81b6017d4d01a45' 
  AND token = 'GddWzO9fz3nl5zM4ezc8Li5Mwbuv8lKgYbI/uvQQsCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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