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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2597a279cfbba9baa2502405adc8c992a5bf200f07ee48e9340b0701e8e59985' 
  AND token = 'hiu7x4ku+D194jfpem1SE/VUaFuiGxCxnlpG4k1fods=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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