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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6831d0a3bba1b3dd6c62d86bc112d99531e3c2f45cd1146fcb8cc625fd38504d' 
  AND token = 'lpnNTOMa4MTleThUkR3G8V5qK6rBG9euSRK0OIRGBtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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