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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '472f28b00eef0d43625b6ee1d56b90a18e698068cfbd7e955c83ef77c238f881' 
  AND token = 'r5bVMCzlIeihfk1hXXES0ytbbLU0CsYtJ7lxBybmICk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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