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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4fc0d5600db87f71b978a2fc36fbde50ccb1b53a5b555b4e8cef0ebca2718f7d' 
  AND token = 'X5tECBPXmmhtUfwggJNv83N4uXtWaidAkWO3zuSUwnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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